Crushing-mill.



No. 642,0l6. Patented Ian. 23, I900. T. L. 81. T. J. STURTEVANT.

CRUSHING MILL.

(Application filed May 18, 1899.1

4 Sheets-Sheet l.

@X wmww f6 yw No. 642,05. Patented Ian. 23, I900. T. L. 8:. T. J.STURTEVANT.

CRUSHING MILL.

(Application filed May 18. 1899) (No Model.) 4 Sheets-Sheet 2.

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No. MZJJIG. Patented Jan. 23, I900.

T. L. & T. J. STURTEVANT.

CRUSHING MILL.

(Application filed may 18, 1899.)

4 Sheets-Sheet 3.

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No. 642,fi|6. Patented Jan. 23, I900.

T. L. 8:. T. J. STURTEVANT.

CRUSHJNG MILL.

(Application filed May 18. 1899.) Modem 4 Sheets-Sheet Qmmmw a 6 26% vsno, wom Lmh) WASHINGTON u c TTis STATES PATENT OFFICE.

THOMAS L. STURTEVANT, OF QUINCY, AND THOMAS J. STURTEVANT, OF

NEWTON, MASSACHUSETTS.

CRUSHlNG-MILL.

SPECIFICATION forming part of Letters Patent No. 642,016, dated January23, 1900.

Application filed May 18, 1899. Serial No. 717,348. (No model.)

To all whom it may concern:

Be it known that we, THOMAS L. STURTE-' roller-crushers, in which acrushing-roll working against a second roll or a stationaryanvil-surface crushes and reduces the ore or material, which is fedbetween them from a hopper or suitable feeding-ways.

The essential feature of ourinvention con-' sists in the novelconstruction of the crushing-roll, which will be called hereinafter thehammerroll,for the reason that in its construction the roll employs aseries of radially or inwardly and outwardly movable pivoted hammerswhich are circumferentially placed with respect to the ro1l-shaft andwhich when the shaft is running at high speed are held projected bycentrifugal force and strike a succession of blows upon the opposingroll, which maybe of similar or ordinary construction. Itwill beunderstood that the radiallymovable hammers carried by the hammer rollor rolls not only strike radial pinching blows, due to their centrifugalprojection, but also deliver tangential blows upon the material as theyapproach the opposing member. The result of this action is the crushingof the material between the hammer-roll and the opposing member by asuccession of blows from the pivoted hammers, which pinch and pulverizethe material between the hammerfaces and the opposing member, and yet onaccount of the radial movement of the hammers and the yielding orflexible construction of the hammer roll or rolls the crushing strain isnot transmitted directly to the driving shafts of the rolls and to themachine'frame, thereby providing a machine in which there will be lessfriction on the shafts and less strain on the m achine-frame and thebearings than where the crushing-faces of the rolls, as in ordinaryroller-crushers, are unyielding and crush the material entirely by apinching action, our improvements thus permitting a much lighter frameconstruction than in ordinary roller-crushers.

In the accompanying drawings, Figure 1 is a side elevation of a mill inwhich our improved erushing-roll opposed to an anvil-roll is utilized,this view showing the bearings and relative positions of the parts. Fig.2 is a central vertical section of the mill shownin Fig. 1. Fig. 3 is anelevation, partly in vertical section, on line 3 3 of Fig. 2. Fig. 4 isa view of the hammer-roll and anvil-roll, showing the rolls adjustedcloserto each other than in Fig. 2. Fig. 5is a centralvertical sectionof a mill employing two hammer-rolls. Fig. 6 is an end view of amodified form of hammer-roll, and Fig. 7 is a detail View of the same.Fig. 8 is a detail view of a form of hammer which will be referred tohereinafter.

Referring to the drawings, B denotes the lower half of the mill-casing,provided with a suitable discharge-opening and which casing B will inpractice be mounted on suitable supports.

0 is the upper half of the mill-casing, said upper casing being boltedto the lower casing 13 by bolts 0 in order that the upper casing may bereadily removed to permit access to the rolls.

D is the feeding-hopper, which is of ordinary construction and is seatedin a hopperopening in the top of easing C, said hopper D beingpreferably provided with an adj ustable plate (l, by means of which thefeed of the material may be regulated as desired.

Mounted on suitablysupported bearingblocks 1) are shaft-boxes orjournal-bearings Z), one of which is adjustably secured on its blocks 1)by means of the bolts 1), as shown in Fig. 1, shims 11 being provided toallow adjustment of one set of the boxes I) and the shaft journaledtherein toward and from the other shaft. The blocks 7) are preferablybolted together by means of the tie-rods I). (See Fig. 1.) Journaled inthe boxes I? are the roller-shafts E E, each of which is provided with adriving-pulley 6 The shaft E has keyed to it, as shown in Fig. 2, acrushing-roll having a barrel 6 and the hard crushing-tire c, this rollforming what we term the anvil-roll, since it receives the blows of thehammers mounted in the hammer-roll, which is-supported by shaft E.

Mounted on the shaft E is the flanged hub F, and between the flangesfofsaid hub are pivoted the hammers f, said hammers being provided withslots f through which pass the pivot-bolts f each of these pivot-boltsextending across the roll and supporting a series of hammers. As shownin Fig. 2, these hammers are mounted circumferentially about the flangedhub f, so that they form substantially a continuous face, and when theroll is being rotated rapidly the said hammers f are thrown outwardly bycentrifugal force and strike and pinch the material fed from the hopperD between the hammer-roll and the anvil-roll. The result of such actionis to thoroughly crush and pulverize the material, and yet any severestrain upon the shafts E E is avoided, for the reason that the hammersyield and move inwardly after delivering their blows, so that the strainis taken off the bearings and mill-casing.

By adjusting the rolls toward and from each other the action of thecrushing-ham mers may be increased or diminished, as desired, for, asshown in Fig. 4, it will be seen that by moving the rolls closertogether the number of the hammers in action, and consequently thecrushing power of the mill, is increased.

In the type of mill shown in Fig. 5 the anvilroll is dispensed with andtwo hammer-rolls are employed, as hereinbefore suggested, the secondhammer-roll being mounted on the shaft E and taking the place of theanvil-roll shown in Fig. 2, both of the said hammerrolls having radiallyor inwardly and outwardly movable hammers or weights f, having slots ffor the reception of pivot-boltsf Instead of slotting the hammers theymay be provided with trunnions f as shown in Figs. 6 and7, and in theconstruction shown in these figures the trunnions pass through slots fin aseries of removable disks f which are mounted on the hammer-rollshaft E and held together by tie-bolts f to allow of their ready removalfor insertion of the hammers, suitable'spacimar-collarsf beinginterposed between the disks f In Fig. 8 is shown a hammer I, providedwith a slightly-concaved face i, which is especially adapted for usewith the anvil-roll used in the type of mill shown in Fig. 2. When thisconcave-faced hammer I is u sed,a greater amount of material is caughtand crushed between the face of the hammer and the anvilroll than when ahammer having a convex face, such as shown in the other figures, isemployed. If desired, coil-springs i Fig. 8,

may be inserted in the slots f of the hammers so that they will benormally held extended, or rubber blocks may be employed instead of saidsprings. This, however, is not essential, for as soon as the mill isstarted centrifugal action carries the hammers outward to their normalprojected positions.

We do not wish to be understood as limiting our invention to the detailsherein shown, as these may be varied widely within the province ofmechanical skill, as will be understood.

Having thus described our invention, we claim and desire to secure byLetters Patent 1. In a crushing-mill, the combination with an opposingroll, of a crushing hammer-roll provided with a series of pivotedhammers having slotted connections with the body of said hammer-roll,whereby the said hammers are adapted to strike yielding blows and to beprojected outward by centrifugal force, during rotation, to crush thematerial between them and the periphery of said opposing roll, saidslotted connections permitting said hammers to yield inwardly toexcessive resistance.

2. In a crushing-mill, the combination with an opposing roll, of acrushing hammer-roll provided with a series of pivoted hammers havingslotted connections with the body of said hammer-roll, whereby the saidhammers are adapted to strike yielding blows and to be projected outwardby centrifugal force, during rotation, to crush the material betweenthem and the periphery of said opposing roll, said slotted connectionspermitting said hammers to yield inwardly to excessive resistance, andmeans for adjusting one of said rolls relative to the other.

3. In a crushing-mill, the combination with a hammer-roll having apractically continuous, yielding or flexible, acting face composed of aseries of pivoted hammers having slotted connections with the body ofsaid roll and adapted to be held projected outward when the machine isrunning by centrifugal force, of an opposing roll between the peripheryof which and the said hammers the material is crushed by the conjointaction of said hammers and opposing roll.

4. In a crushing-mill, two cooperating rolls the acting faces of both ofwhich consist of practically continuous, yielding or flexible, actingfaces composed of pivoted and inwardly and outwardly or radially movablehammers or weights adapted to be held outwardly, or toward each other,by centrifugal force, to crush the material between the said hammers orweights, and to yield inwardly to excessive resistance.

5. In a crushing-mill, the combination with a hammer-roll having ayielding or flexible, acting face composed of a series of hammers orweights which are inwardly and outwardly Iran movable bocli1y,'and whichare adapted to be held projected outward, by centrifugal force, when themachine is running, and which are also adapted to yield inwardly toexcessive resistance, of an opposing roll between the periphery of whichand the said hammers or weights the material is crushed.

In testimony whereof we affix our signatures in the presence of twowitnesses.

THOMAS L. STURTEVANT. THOMAS J. STURTEVANT. Witnesses:

W. H. ELLIS, FRED W. CONNOLLY.

